Ecological interactions among pherotic mites, bark beetles, and fungi are complex and diverse. Pherotic mites play important roles in many insect and fungal systems, but are poorly understood. This paper presents recent advances in research on the ecological interactions among mites, bark beetles, and their associated ophiostomatoid fungi, focusing on the feeding habits of pherotic mites and the factors that influence their attachment, separation, and dispersal behaviors. In addition, interactions among pherotic mites, bark beetles, and fungi are analyzed and described. Moreover, case studies of several bark beetle species of the genera Dendroctonus, Scolytus, and Ips and their fungi and mites are comprehensively discussed, with emphasis on the chemo-ecological interactions among these taxa.